Orthoteers homepage Advertise on Orthoteers
Orthoteers Junior Orthoteers Orthopaedic Biomechanics Orthopaedic World Literature Society Educational Resources Image Gallery About Orthoteers Orthoteers Members search

Carpometacarpal arthritis of the thumb – rhizarthrosis

ANATOMY

Key joint of the thumb

Saddle-shaped joint

Biconcavo-convex shape

Joint compression force = 12kg (120kg for strong grip)

3 Main ligamentous stabilisers:

1. Volar or Beak ligament

  • most NB ligament - primary static stabiliser
  • very strong
  • prevents dorsal translation of the MC in key pinch
  • Allows rotational motion
  • Evolutionary remnant of the bony palmar beak
  • synonyms = volar oblique lig., anterior oblique lig.(AOL), volar CMC lig., deep ulnar lig.
  • Important in Bennett's Fractures

2. Dorsal ligament

  • thin & reinforced by APL

3. Lateral ligament

  • broad band running from lateral surface of trapezium to 1st MC base

 

PATHOPHYSIOLOGY

Described by Pelligrini (1991) following examination of cadaveric & surgical specimens.

Attritional changes in the beak lig. leads to destabilisation of the 1st CMCJ causing degenerative changes.

These changes initially occur in the palmar contact areas of the joint.

 



This is a preview of the site content. To view the full text for this site, you need to log in.
If you are having problems logging in, please refer to the login help page.


© 2005-2007 Orthoteers.co.uk - last updated by Len Funk on 11 October 2006Medical Merketing and SEO by Blue Medical 
Biomet supporting orthoteersThe British Orthopedic Association supporting OrthoteersOrthoteers is a non-profit educational resource. Click here for more details
Specific Nerve Injuries & Tendon Transfers
Acute Wrist Trauma
Advances in Distal Radius Fracture ...
Algorithm for distal Radius fractur...
Anatomy & Pathophysiology
Aphert Syndrome
Carpometacarpal arthritis of the th...
Chronic Wrist Pain
Colle's Type Fracture Manipulation
Compressive Neuropathies
Congenital Hand Disorders
CRPS
Distal Radius Fractures
Dupuytren’s - Related Research
Dupuytren's Disease
Hand - Tendon Transfers
Hand Fractures
Hand Infections
Hand Syllabus for FRCS (Tr & Orth)
Hand Trauma & Compartment Syndrome
Hand Tumours
Indications for Reduction in Distal...
Inflammatory Arthritis
Jules Tinel
Kienbock's Disease
Nerve Injuries - Principles
Replantation & Microsurgery
Scaphoid Fractures
Scapholunate Ligament Rupture
Tendon Injuries
Tendon Transfer - Principles
Ulnar Nerve Palsy Signs
Vascular Disorders
Wrist Arthroscopy
Wrist Instability
Wrist Osteoarthritis
Hide Menu